Please note - the step about removing the battery is part of a pre-requisite guide, that is used for many of the guides, most that do require removal of the battery. Also, working inside a disassembled laptop with the battery still connected risks damaging/shorting out very expensive parts.

I replaced a hard drive in a MacBook Pro of an earlier model than this without removing the battery. The hard drive wasn't right. It only worked at about half speed, and I had to replace it once more. The second time I removed the battery and all went well. The recommendation by the iFixit staff to remove the battery before working on electronic equipment is a good one.

My T6 (appears to be same screw driver you have - $6 on amazon for 20piece set) did NOT fit int he battery screws...not sure if I had the wrong screws or what, but I went ahead w/o battery steps and it was pretty easy.

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Apple sticks a small strip of clear plastic with adhesive applied to one side to the logic board behind the camera cable connector to keep it in its socket. When moving it out of the way, be sure not to break any surface-mount components off the logic board.

Hold the end of the cable retainer down with one finger while you use the tip of a spudger to slightly lift the other end and rotate it away from the camera cable connector.

I would recommend leaving the camera cable plugged into the motherboard, and simply sliding the optical drive out from underneath it carefully. If you mistakenly life this connector straight up (as I did) you can damage either the cable connector or the motherboard socket. I damaged the connector on the cable and now the wifi antenna doesn't work. Replacing this damaged cable is about 10X more of a pain (in time and money) than the effort to slide the optical drive out from beneath this cable instead of disconnecting it.

I agree, the same issue happened to me (My MBP no longer recognizes its wi-fi adapter). The black connector is very fragile, and very hard to slide back in after you take it out. Try not to disconnect it if you can.

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When installing the HD bay, the screws here will not go back. Not sure if the bracket/holes are somehow different. After completing the install, everything seems secure. Does anyone think not having these screws is critical beyond securing the drive?

So recently I switched from "smcFanControl" to "Macs Fan Control" ( because I wanted temperature controlled fan speeds ) and it has been running really well. so I thought that today was a good time ( 1:00 or 1AM ) to do some system maintenance on my MacBook Pro. And out came my trusty "iFixIt 54 bit driver Kit" and off went the bottom to dust everything out to prepare for the winter.

I was also feeling brave enough to tackle my little problem, you see I have noticed for a while a crackling sound in my speakers and I am not one to crank it up to 11, so I assumed that something might have gotten in there between the grill and the speaker ( I also thought it would be neat to check out this whole speaker subwoofer assembly ). I also just recently noticed it earlier on the right side which is directly above the optical drive ( yes I still have one of those! ) so I figured it would be pretty easy to quickly get to and I was right. all went fine and dandy until I went to unplug the cable for the speaker………… Whereupon, I IMMEDIATELY RIPPED THE CONNECTOR OFF THE CIRCUIT BOARD!!!!!!!!! Now mind you I've been through this before and I certainly wasn't rushing it, I already knew which way the connector worked because I discovered them when I took the fans out to clean them...